// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef GPU_COMMAND_BUFFER_SERVICE_ID_MANAGER_H_
#define GPU_COMMAND_BUFFER_SERVICE_ID_MANAGER_H_

#include "base/basictypes.h"
#include "base/containers/hash_tables.h"
#include "gpu/command_buffer/service/gl_utils.h"
#include "gpu/gpu_export.h"

namespace gpu {
namespace gles2 {

    // This class maps one set of ids to another.
    //
    // NOTE: To support shared resources an instance of this class will
    // need to be shared by multiple GLES2Decoders.
    class GPU_EXPORT IdManager {
    public:
        IdManager();
        ~IdManager();

        // Maps a client_id to a service_id. Return false if the client_id or
        // service_id are already mapped to something else.
        bool AddMapping(GLuint client_id, GLuint service_id);

        // Unmaps a pair of ids. Returns false if the pair were not previously mapped.
        bool RemoveMapping(GLuint client_id, GLuint service_id);

        // Gets the corresponding service_id for the given client_id.
        // Returns false if there is no corresponding service_id.
        bool GetServiceId(GLuint client_id, GLuint* service_id);

        // Gets the corresponding client_id for the given service_id.
        // Returns false if there is no corresponding client_id.
        bool GetClientId(GLuint service_id, GLuint* client_id);

    private:
        typedef base::hash_map<GLuint, GLuint> MapType;
        MapType id_map_;

        DISALLOW_COPY_AND_ASSIGN(IdManager);
    };

} // namespace gles2
} // namespace gpu

#endif // GPU_COMMAND_BUFFER_SERVICE_ID_MANAGER_H_
